CN108194076B - Calibration interpretation method, device and chart for bidirectional pulse neutron oxygen activation logging instrument - Google Patents
Calibration interpretation method, device and chart for bidirectional pulse neutron oxygen activation logging instrument Download PDFInfo
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- CN108194076B CN108194076B CN201711448422.5A CN201711448422A CN108194076B CN 108194076 B CN108194076 B CN 108194076B CN 201711448422 A CN201711448422 A CN 201711448422A CN 108194076 B CN108194076 B CN 108194076B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/11—Locating fluid leaks, intrusions or movements using tracers; using radioactivity
Abstract
The invention discloses a calibration interpretation method of a bidirectional pulse neutron oxygen activation logging instrument, which comprises the following steps: establishing a vertical simulation well system with various polymer concentrations and various well conditions in the well; measuring oxygen activation log time spectral data in the vertical simulated well system using a bi-directional pulsed neutron oxygen activation logging tool; drawing an oxygen activation time spectrum curve according to the oxygen activation logging time spectrum data; carrying out a weighted average method or a least square method on the oxygen activation time spectrum curve to obtain the transit time; obtaining calculated flow according to the transit time and the source distance; establishing a corresponding relation between the calibration flow and the corresponding calculated flow; and then, explaining the next calculated flow according to the corresponding relation. As well as devices and plates. The method can solve the problems that the oxygen activation well logging interpretation method has larger error under the condition of polymer and ternary combination flooding medium and cannot be applied to fine interpretation.
Description
Technical Field
The invention relates to the field of well logging information interpretation of injection and production profiles of water injection wells and polymer injection well logging, in particular to a calibration interpretation method, a device and a chart for a bidirectional pulse neutron oxygen activation logging instrument.
Background
The existing two-way pulse neutron oxygen activation logging instrument only has a calibrated logging curve and a calibrated interpretation chart under the condition that a casing medium is clear water. When the medium in the explaining well is polymer and the ternary combination flooding is performed, the error of the calibration explaining plate under the condition of clear water is large, and fine explanation cannot be performed.
Disclosure of Invention
In view of the above, the invention provides a calibration interpretation method, device and plate for a bidirectional pulse neutron oxygen activation logging instrument, so as to solve the problem that the conventional bidirectional pulse neutron oxygen activation logging has a large interpretation error under polymer and ternary composite flooding media.
In a first aspect, the invention provides a calibration interpretation method for a bidirectional pulse neutron oxygen activation logging instrument, which comprises the following steps:
establishing a vertical simulation well system with various polymer concentrations and various well conditions in the well;
measuring oxygen activation log time spectral data in the vertical simulated well system using a bi-directional pulsed neutron oxygen activation logging tool;
drawing an oxygen activation time spectrum curve according to the oxygen activation logging time spectrum data;
carrying out a weighted average method or a least square method on the oxygen activation time spectrum curve to obtain the transit time;
obtaining calculated flow according to the transit time and the source distance;
establishing a corresponding relation between the calibration flow and the corresponding calculated flow;
and then, explaining the next calculated flow according to the corresponding relation.
Preferably, establishing the vertical simulated well system comprises: establishing a polymer configuration system and establishing a remote control flow acquisition system;
5 polymers with different concentrations are configured through the polymer configuration system, the flow, temperature and humidity information of the simulation well is acquired through the remote control flow acquisition system, and the flow of the simulation well is remotely controlled; the packer system of the remote control flow acquisition system realizes the plugging of a simulation well, and switches a simulation oil pipe of the simulation well, a simulation sleeve and a ring space formed by the simulation oil pipe simulation sleeve;
the remote control flow acquisition system adjusts the flow of the simulation well according to the deviation between the flow and the calibration flow, so that the oxygen activation logging time spectrum data is measured by using the bidirectional pulse neutron oxygen activation logging instrument after the flow of the simulation well is the same as the calibration flow;
and the temperature and humidity information is used for detecting the well environment of the simulation well.
Preferably, the calibration flow is 30m2And selecting the curve with the maximum second peak value in the oxygen activation time spectrum curve to perform weighted average operation to obtain the transition time.
Preferably, the pulse oxygen activation logging instrument is used for respectively measuring the medium flow rates of the simulation casing, the simulation oil pipe and the annular sleeve space, the source distance is divided by the transit time to obtain the flow rate, and then the flow rate is multiplied by the cross-sectional area of the space where the medium is located to obtain the calculated flow rate.
In a second aspect, the present invention provides a calibration interpretation device for a bidirectional pulse neutron oxygen activation logging instrument, comprising:
establishing a vertical simulation well system with various polymer concentrations and various well conditions in the well; and
a memory and a processor and a computer program stored on the memory and executable on the processor, the computer program being a bi-directional pulsed neutron-oxygen activation tool calibration interpretation method as described above, the processor implementing the following steps when executing the program:
controlling a bidirectional pulse neutron oxygen activation logging instrument to measure oxygen activation logging time spectrum data in the vertical simulation well system;
drawing an oxygen activation time spectrum curve according to the oxygen activation logging time spectrum data;
carrying out a weighted average method or a least square method on the oxygen activation time spectrum curve to obtain the transit time;
obtaining calculated flow according to the transit time and the source distance;
establishing a corresponding relation between the calibration flow and the corresponding calculated flow;
and then, explaining the next calculated flow according to the corresponding relation.
In a third aspect, the present invention provides a calibration interpretation plate for a bi-directional pulse neutron oxygen activation logging instrument, comprising:
the method for calibrating and explaining the bidirectional pulse neutron oxygen activation logging instrument or the device for calibrating and explaining the bidirectional pulse neutron oxygen activation logging instrument are provided;
drawing a scatter diagram according to the calibration flow and the corresponding calculated flow, wherein the scatter diagram reflects the corresponding relation;
the calibration flow is an abscissa or an ordinate, and the calculation flow is an ordinate or an abscissa.
The invention has at least the following beneficial effects:
the invention provides a calibration interpretation method, a device and a chart for a bidirectional pulse neutron oxygen activation logging instrument, which aim to solve the problem that the conventional bidirectional pulse neutron oxygen activation logging instrument has larger interpretation error under polymer and ternary combination flooding media.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic flow chart illustrating a calibration and interpretation of a bi-directional pulsed neutron oxygen activation logging tool according to an embodiment of the present invention;
FIG. 2 is a schematic view of an apparatus for deploying a polymer according to an embodiment of the present invention;
FIG. 3 is a system block diagram of a remote control traffic collection system of an embodiment of the present invention;
FIG. 4 is a schematic view of a packer system in accordance with an embodiment of the invention;
FIG. 5 is a schematic diagram of a bi-directional pulsed neutron oxygen activation apparatus according to an embodiment of the present invention;
FIG. 6 is a bi-directional pulsed neutron oxygen activation log time spectrum of an embodiment of the present invention;
FIG. 7 is a schematic diagram of a time of flight calculated using the least squares method according to an embodiment of the present invention;
FIG. 8 is an oxygen activation explanation plate of the casing tube of the embodiment of the present invention in which the medium inside the 128mm casing tube is clear water (concentration 0 ppm);
FIG. 9 is an oxygen activation interpreted version of a 500ppm polymer concentration in the medium of 128mm sleeve of an embodiment of the present invention;
FIG. 10 is an oxygen activation interpreted version of a cannula of an embodiment of the present invention having a concentration of 1000ppm polymer in the 128mm media;
FIG. 11 is an oxygen activation interpreted version of a 1500ppm polymer concentration in the medium within 62.5mm of an oil pipe of an embodiment of the present invention;
FIG. 12 is an oxygen activation interpreted version of a 2500ppm polymer concentration medium in 62.5mm oil pipe of an example of the invention;
FIG. 13 is an oxygen activation interpretation plate of the invention with 1500ppm polymer concentration as the medium in the oil jacket annulus.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the invention, features and advantages thereof, and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
Fig. 1 is a schematic flow chart for calibrating and explaining a bi-directional pulsed neutron oxygen activation logging tool according to an embodiment of the present invention. As shown in fig. 1, a calibration interpretation method for a bidirectional pulse neutron oxygen activation logging instrument includes: 101, establishing a vertical simulation well system with various polymer concentrations and well conditions in a well; step 102, measuring oxygen activation logging time spectrum data by using a bidirectional pulse neutron oxygen activation logging instrument in a vertical simulation well system; 103, drawing an oxygen activation time spectrum curve according to the oxygen activation logging time spectrum data; 104, carrying out a weighted average method or a least square method on the oxygen activation time spectrum curve to obtain the transit time; step 105, obtaining calculated flow according to the transit time and the source distance; step 107, establishing a corresponding relation between the calibration flow and the corresponding calculated flow; after step 108, the next calculated flow is interpreted according to the corresponding relationship.
Further, the calibration flow is 30m2And selecting the curve with the maximum second peak value in the oxygen activation time spectrum curve to perform weighted average operation to obtain the transition time.
Further, the medium flow velocity of the simulated casing, the simulated oil pipe and the annular sleeve space is respectively measured by a pulse oxygen activation logging instrument, the source distance is divided by the transit time to obtain the flow velocity, and then the flow velocity is multiplied by the cross-sectional area of the space where the medium is located to obtain the calculated flow.
FIG. 2 is a schematic view of an apparatus for deploying a polymer in accordance with an embodiment of the present invention. Fig. 3 is a system block diagram of a remote control traffic collection system according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a packer system in accordance with an embodiment of the invention. As shown in fig. 2-4, a vertical simulated well system is established, comprising: establishing a polymer configuration system and establishing a remote control flow acquisition system; 5 polymers with different concentrations are configured through a polymer configuration system, the flow, temperature and humidity information of the simulation well acquired by the flow acquisition system is remotely controlled, and the flow of the simulation well is remotely controlled; the packer system of the remote control flow acquisition system realizes the plugging of a simulation well, and switches a simulation oil pipe of the simulation well, a simulation sleeve and a ring space formed by the simulation oil pipe simulation sleeve; the remote control flow acquisition system adjusts the flow of the simulation well according to the deviation between the flow and the calibration flow, so that the flow of the simulation well is the same as the calibration flow, and then the bidirectional pulse neutron oxygen activation logging instrument is used for measuring the time spectrum data of the oxygen activation logging; temperature and humidity information for detecting the in-well environment of the simulated well.
First, in the experimental calibration section, specifically, in the polymer preparation system, 5 kinds of polymers with different concentrations, wherein the polymer is Polyacrylamide (PAM) and the concentrations are 500ppm, 1000ppm, 1500ppm, 2000ppm, and 2500ppm, respectively, need to be prepared.
In FIG. 2, taking the preparation of a polymer solution with a concentration of 500ppm as an example, 10 cubic meters of clear water is added into a curing tank 5, 5Kg of polyacrylamide is added into a material port 2, a dry powder pump 3 accelerates the falling of the polyacrylamide in a material port 2, a blower 1 is used for blowing the polyacrylamide into a water powder mixer 4, the polyacrylamide enters the curing tank 5 after being uniformly mixed, the stirring is stopped after the polyacrylamide is stirred for 30min by the water powder mixer 4, and the polymer solution is cured for 6 hours in the curing tank 5. Before the start of the experiment, the experiment was started after the prepared polymer solution was stirred for 20min with the water-powder mixer 4. When the concentration of the polymer solution is increased by 500ppm, 5Kg of polyacrylamide is added during preparation, the dosage of clear water is kept unchanged during preparation, and the preparation process is the same as that of the polymer solution with the preparation concentration of 500 ppm. In fig. 2, both the electric pump 6 and the jet lift pump 7 add flow force to the simulated wellbore flow and the deployed polymer is controlled by the polymer console 11 of fig. 3.
In the present invention, a remote control traffic collection system comprises: a computer control system and a packer system. The computer control system (a main control console 8 in fig. 3) is connected with the simulated well, collects the information of the simulated well and remotely controls the well condition of the simulated well; and the packer system is arranged in the simulation well and used for plugging the simulation well and switching the well condition of the simulation well. The invention gives more reliable and accurate experimental data to the instrument under different well conditions, can realize the work of the existing detection equipment by applying the remote control operation function by adopting the distance protection and can be used for the application of the remote control technology.
Fig. 3 is a system block diagram of the remote control flow acquisition system in the present invention, which includes: a master console 8, an intranet data switch 9, a temperature and humidity sensor 10 and a polymer console 11.
In fig. 3, a polymer console 11 is used to control the polymer flow rate in the simulated wellbore. And the computer control system is connected with the simulation well or the simulation well experiment console through the data exchange unit. Specifically, the data exchange unit of the present invention may be an intranet data exchange 9. The computer control system is also connected with a temperature/humidity sensor 10, and the well condition of the simulated well is remotely controlled according to the temperature information and the humidity information.
As shown in fig. 4, a packer system for remotely controlling a flow acquisition system, comprising: a ball collector 12, a high pressure line 13 and a hand-driven pressure pump 14. The rubber ball collector 12 is connected with a hand-driven pressure pump 14; and the hand-driven pressure pump 14 controls the rubber ball collector 12 to plug the simulation well and switches the well condition of the simulation well. Specifically, the design of the sealing section can reliably seal, can reflect the working state of the downhole packer system faithfully, has the advantages of convenient unsealing and reliable sealing, and realizes measurement calibration and experimental work of the flow in the oil jacket by plugging the oil pipe; meanwhile, the flow pattern and flow state change in the ring can be observed through a computer control system.
Specifically, in fig. 3 and 4, two ends of the ball collector 12 are respectively connected with the oil pipe, the ball collector 12 is put into the simulation well (i.e. a casing), and the annular space of the annular sleeve is sealed by expanding the pressing ball on the ball collector 12 to contact with the inner wall of the simulation well, so that only the flow rate of clean water and the flow rate of polymer in the oil pipe are controlled. Namely, the polymer console 11 is connected with the main console 8, and the clear water flow and the polymer flow in the oil pipe are controlled through the polymer console 11 and the main console 8, so that the calibration of oxygen activation logging time spectrum data under different flow rates is realized.
Fig. 5 is a schematic diagram of the principle of the bidirectional pulse neutron oxygen activation apparatus according to the embodiment of the invention. As shown in fig. 5, during the process that the activated water flows through the detectors U1, U2, U3 and U4, the detectors record the gamma-ray time spectrum emitted by the activated water, and the gamma-ray time spectrum recorded by a certain detector is plotted as a graph, as shown in fig. 6, fig. 6 is a time spectrum curve of the bi-directional pulse neutron oxygen activation logging in accordance with the embodiment of the present invention.
In fig. 5, the gamma ray count detected by the detector is increased and then decreased, a peak is formed on the measured time spectrum, the time of the activated water flow reaching the detector, namely the transit time, is calculated, the transit time refers to the average time from the neutron explosion moment to the peak value of the characteristic peak, the distance L of the activated water flow is known, the flow speed is obtained according to V ═ L/. DELTA.t, and then the flow rate is obtained according to the cross-sectional area where the water flow is located.
The distance L between the source and the target is the distance between the target and U1, U2, U3 and U4, which are respectively marked as L1, L2, L3 and L4, and the physical parameters are given when the instrument is purchased.
The transit time delta t is obtained by solving the time from the signal sent by the target pole to the response of the probe through a response curve of the pulse neutron oxygen activation instrument in the calibration simulation well by applying a mathematical method. Two methods for solving the transition time delta t are mainly researched, namely a traditional weighted average method and a least square function fitting method.
1) Weighted average method
To determine the quasi-transit time, the position of the quasi-activation peak on the time spectrum is determined. Because of the statistical fluctuation of the gamma ray counts on each time spectrum in the actual measurement, the position of the maximum count on the time spectrum does not necessarily strictly correspond to the time when the activated water flow passes through the center of the detector. In order to reduce the influence of the count statistical fluctuation on the timing, the transit time is generally calculated according to the radioactive count statistical distribution rule by the following formula:
in the formula, tmIs the transit time; i is the neutron burst starting time corresponding to the time track address on the time spectrum, and i is equal to 0; t is t1And t2 (in FIG. 6) is the time address of the start and end of the artificial peak position, which are located on the left and right of the peak respectivelyTwo sides; y isiIs tiGamma counting of time, which is the count in fig. 6; t is tbIs the temporal width of the neutron pulse. The term 1 on the right side of the formula is the expectation of the median of binomial distribution under the condition of incomplete sample estimation by using a statistical method, the numerator is the summation of products of time and count in a peak, namely the summation of products of probability and occurrence time of a gamma event is recorded, the denominator is the total count in the peak, and the numerator is divided by the denominator to obtain the most probable occurrence time of the gamma event; the right term 2 of the formula considers the influence of water flowing during neutron pulse emission, wherein neutrons are emitted from 0 moment to tb(in FIG. 6) the emission is stopped at the moment, and assuming that the neutron flux is stable during the neutron burst, the center of the activated water flow at the time of the neutron pulse stop is located at 1/2t on the time axisbTo (3). The traditional method for calculating the transit time has high calculation speed and high timeliness, and is relatively suitable for quick and intuitive explanation.
2) Least squares function fitting method
In many practical problems, it is often necessary to rely on two variables yiAnd tiTo find an approximation (also called empirical formula) of the functional relationship of these two variables from n sets of experimental data (i ═ 1, 2, n), this process is called curve fitting. The most common curve fitting method is polynomial fitting based on the ordinary least squares method.
The basic principle of the least square curve fitting method is to assume a group of data points obey a polynomial, and determine coefficients of each term in the polynomial according to the principle of the least square method. Then, the experimental values are replaced by the values of the polynomial, so as to achieve the purpose of data smoothing. Referring to fig. 7, fig. 7 is a schematic diagram of a transit time obtained by the least square method according to the embodiment of the present invention; the time corresponding to the maximum peak of the fitted curve is the transit time, and in fig. 7, the dotted line is the time spectrum curve of the fitted curve, and the solid line is the time spectrum curve after fitting.
And finally, calculating the flow velocity V, and after calculating the transit time, calculating the flow velocity according to the L/delta t, wherein the source distance L is an instrument physical parameter, the transit time is the calculated flow rate, and the flow rate is given through the simulated well and calculated by the instrument.
Meanwhile, the invention provides a calibration interpretation device of a bidirectional pulse neutron oxygen activation logging instrument, which comprises: establishing a vertical simulation well system with various polymer concentrations and various well conditions in the well; and a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the computer program is the method for calibrating and interpreting the bi-directional pulse neutron-oxygen activation logging instrument, and the processor executes the program to realize the following steps: controlling a bidirectional pulse neutron oxygen activation logging instrument to measure oxygen activation logging time spectrum data in a vertical simulation well system; drawing an oxygen activation time spectrum curve according to the oxygen activation logging time spectrum data; carrying out a weighted average method or a least square method on the oxygen activation time spectrum curve to obtain the transit time; obtaining calculated flow according to the transit time and the source distance; establishing a corresponding relation between the calibration flow and the corresponding calculated flow; and then, explaining the next calculated flow according to the corresponding relation. The specific description can refer to the specific steps of the calibration interpretation method of the bidirectional pulse neutron oxygen activation logging instrument, and the detailed description is not provided herein.
The invention relates to a calibration and interpretation chart of a bidirectional pulse neutron oxygen activation logging instrument, which comprises the following components: the method for calibrating and interpreting the bidirectional pulse neutron oxygen activation logging instrument or the device for calibrating and interpreting the bidirectional pulse neutron oxygen activation logging instrument; drawing a scatter diagram according to the calibrated flow and the corresponding calculated flow, wherein the scatter diagram reflects the corresponding relation; calibrating the flow rate to be an abscissa or an ordinate, and calculating the flow rate to be the ordinate or the abscissa, as shown in fig. 8-13, fig. 8 is an oxygen activation explanation chart of the casing tube of the embodiment of the present invention in which the medium in 128mm is clear water (concentration 0 ppm); FIG. 9 is an oxygen activation interpreted version of a 500ppm polymer concentration in the medium of 128mm sleeve of an embodiment of the present invention; FIG. 10 is an oxygen activation interpreted version of a cannula of an embodiment of the present invention having a concentration of 1000ppm polymer in the 128mm media; FIG. 11 is an oxygen activation interpreted version of a 1500ppm polymer concentration in the medium within 62.5mm of an oil pipe of an embodiment of the present invention; FIG. 12 is an oxygen activation interpreted version of a 2500ppm polymer concentration medium in 62.5mm oil pipe of an example of the invention; FIG. 13 is an oxygen activation interpretation plate of the invention with 1500ppm polymer concentration as the medium in the oil jacket annulus.
Oxygen activation of polymers the explanation plates were used specifically: the response curve is obtained through measurement of the bidirectional pulse neutron oxygen activation logging instrument, the transit time delta t is calculated according to the calculation method, the measured flow is calculated and solved according to the source distance L given by the used probe, as shown in figures 8-13, the chart is inquired, and the standard flow corresponding to the measured flow is the corrected flow.
The flow rate measured by the instrument is calculated and solved, as shown in table 1, after the chart is inquired, the flow rate points are randomly extracted and compared, so that the corrected flow rate error obtained after the explaining chart is used is smaller, and the result is more accurate.
TABLE 1 error COMPARATIVE TABLE before and after correction of FLOW
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, substitutions of equivalents, improvements and the like can be made without departing from the spirit of the invention, and these are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A calibration interpretation method for a bidirectional pulse neutron oxygen activation logging instrument is characterized by comprising the following steps:
establishing a vertical simulation well system with various polymer concentrations and various well conditions in the well;
measuring oxygen activation log time spectral data in the vertical simulated well system using a bi-directional pulsed neutron oxygen activation logging tool;
drawing an oxygen activation time spectrum curve according to the oxygen activation logging time spectrum data;
carrying out a weighted average method or a least square method on the oxygen activation time spectrum curve to obtain the transit time;
obtaining calculated flow according to the transit time and the source distance;
establishing a corresponding relation between the calibration flow and the corresponding calculated flow;
then, explaining the next calculated flow according to the corresponding relation;
wherein establishing the vertical simulated well system comprises: establishing a polymer configuration system and establishing a remote control flow acquisition system;
the polymer configuration system is used for configuring polymers with different concentrations, and the remote control flow acquisition system is used for acquiring flow, temperature and humidity information of a simulation well and remotely controlling the flow of the simulation well; the packer system of the remote control flow acquisition system realizes the plugging of a simulation well, and switches a simulation oil pipe of the simulation well, a simulation sleeve and a ring space formed by the simulation oil pipe simulation sleeve;
and the remote control flow acquisition system adjusts the flow of the simulation well according to the deviation between the flow and the calibration flow, so that the oxygen activation logging time spectrum data is measured by using the bidirectional pulse neutron oxygen activation logging instrument after the flow of the simulation well is the same as the calibration flow.
2. The method for calibrating and explaining the bidirectional pulse neutron oxygen activation logging instrument according to claim 1, wherein the method comprises the following steps:
the calibration flow is 30m2And selecting the curve with the maximum second peak value in the oxygen activation time spectrum curve to perform weighted average operation to obtain the transition time.
3. The method for calibrating and explaining the bidirectional pulse neutron oxygen activation logging instrument according to claim 1, wherein the method comprises the following steps:
and respectively measuring the medium flow rates of the simulated casing, the simulated oil pipe and the annular sleeve space by using the pulse oxygen activation logging instrument, dividing the source distance by the transit time to obtain the flow rate, and multiplying the flow rate by the cross-sectional area of the space where the medium is located to obtain the calculated flow.
4. A calibration and interpretation device for a bidirectional pulse neutron oxygen activation logging instrument is characterized by comprising:
establishing a vertical simulation well system with various polymer concentrations and various well conditions in the well;
wherein establishing the vertical simulated well system comprises: establishing a polymer configuration system and establishing a remote control flow acquisition system;
polymers with different concentrations are configured through the polymer configuration system, the flow, temperature and humidity information of the simulation well is acquired through the remote control flow acquisition system, and the flow of the simulation well is remotely controlled;
the packer system of the remote control flow acquisition system realizes the plugging of a simulation well, and switches a simulation oil pipe of the simulation well, a simulation sleeve and a ring space formed by the simulation oil pipe simulation sleeve; the remote control flow acquisition system adjusts the flow of the simulation well according to the deviation between the flow and the calibration flow, so that after the flow of the simulation well is the same as the calibration flow, the bidirectional pulse neutron oxygen activation logging instrument is used for measuring the oxygen activation logging time spectrum data
And, a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to invoke the memory-stored instructions to perform the following method:
controlling a bidirectional pulse neutron oxygen activation logging instrument to measure oxygen activation logging time spectrum data in the vertical simulation well system;
drawing an oxygen activation time spectrum curve according to the oxygen activation logging time spectrum data;
carrying out a weighted average method or a least square method on the oxygen activation time spectrum curve to obtain the transit time;
obtaining calculated flow according to the transit time and the source distance;
establishing a corresponding relation between the calibration flow and the corresponding calculated flow;
and then, explaining the next calculated flow according to the corresponding relation.
5. A calibration and interpretation chart of a bidirectional pulse neutron oxygen activation logging instrument is characterized by comprising:
the method for calibrating and interpreting the bidirectional pulse neutron oxygen activation logging instrument according to any one of claims 1 to 3 is used for realizing a calibration and interpretation plate of the bidirectional pulse neutron oxygen activation logging instrument or the device for calibrating and interpreting the bidirectional pulse neutron oxygen activation logging instrument according to claim 4 is used for realizing a calibration and interpretation plate of the bidirectional pulse neutron oxygen activation logging instrument;
drawing a scatter diagram according to the calibration flow and the corresponding calculated flow, wherein the scatter diagram reflects the corresponding relation;
the calibration flow is an abscissa or an ordinate, and the calculation flow is an ordinate or an abscissa.
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